A truly user-friendly website where volumes of groundwater and other well data are available for free. The interface makes use of the very popular Google Maps/Google Earth interface.
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Geotechnical Engineering Directory
They claim to be the most comprehensive Geotechnical Engineering directory on the web. Around since 1999. Visit Geotechnical Engineering Directory
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Earthquake Probability Maps – USGS
You can generate your own earthquake probability maps for your area. Visit Earthquake Probability Maps – USGS
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Western Excelsior Corp.
Western Excelsior Corp. is a manufacturer of rolled erosion control products and sediment retention devices. They also have their own design software. Visit Western Excelsior Corp.